All who dwell on the earth will worship him, everyone whose name has not been written from the foundation of the world in the book of life of the Lamb who has been slain. — Revelation 13:8
All the names of God's chosen people were written in a book.
When?
From the foundation of the world. This book has been around since the foundation of the world.
What is this book?
It is the book of life of the Lamb who has been slain. Which means God had planned a sacrifice for the redemption of His people since before the fall, from the foundation of the world. And this is exactly what we find in the book of Acts.
“Men of Israel, listen to these words: Jesus the Nazarene, a man attested to you by God with miracles and wonders and signs which God performed through Him in your midst, just as you yourselves know— this Man, delivered over by the predetermined plan and foreknowledge of God, you nailed to a cross by the hands of godless men and put Him to death. But God raised Him up again, putting an end to the agony of death, since it was impossible for Him to be held in its power. — Acts 2:22-24
Jesus Christ was delivered over to be nailed to a cross by the predetermined plan of God. Redemption was planned out before the fall ever happened, even from the foundation of the world.
Not only that, but before the foundation of the world His elect people were chosen for salvation.
just as He chose us in Him before the foundation of the world, that we would be holy and blameless before Him. In love — Ephesians 1:4
The counsel of the Lord stands forever, The plans of His heart from generation to generation. — Psalm 33:11
The Lord of hosts has sworn saying, “Surely, just as I have intended so it has happened, and just as I have planned so it will stand, to break Assyria in My land, and I will trample him on My mountains. Then his yoke will be removed from them and his burden removed from their shoulder. This is the plan devised against the whole earth; and this is the hand that is stretched out against all the nations. For the Lord of hosts has planned, and who can frustrate it? And as for His stretched-out hand, who can turn it back?” — Isaiah 14:24-27
“Remember the former things long past, For I am God, and there is no other; I am God, and there is no one like Me, Declaring the end from the beginning, And from ancient times things which have not been done, Saying, ‘My purpose will be established, And I will accomplish all My good pleasure’; Calling a bird of prey from the east, The man of My purpose from a far country. Truly I have spoken; truly I will bring it to pass. I have planned it, surely I will do it. — Isaiah 46:9-11
Why did His purpose include a fall?
Israel has been saved by the Lord With an everlasting salvation; You will not be put to shame or humiliated To all eternity. For thus says the Lord, who created the heavens (He is the God who formed the earth and made it, He established it and did not create it a waste place, but formed it to be inhabited), “I am the Lord, and there is none else. “I have not spoken in secret, In some dark land; I did not say to the offspring of Jacob, ‘Seek Me in a waste place’; I, the Lord, speak righteousness, Declaring things that are upright. “Gather yourselves and come; Draw near together, you fugitives of the nations; They have no knowledge, Who carry about their wooden idol And pray to a god who cannot save. “Declare and set forth your case; Indeed, let them consult together. Who has announced this from of old? Who has long since declared it? Is it not I, the Lord? And there is no other God besides Me, A righteous God and a Savior; There is none except Me. “Turn to Me and be saved, all the ends of the earth; For I am God, and there is no other. “I have sworn by Myself, The word has gone forth from My mouth in righteousness And will not turn back, That to Me every knee will bow, every tongue will swear allegiance. “They will say of Me, ‘Only in the Lord are righteousness and strength.’ Men will come to Him, And all who were angry at Him will be put to shame. “In the Lord all the offspring of Israel Will be justified and will glory.” — Isaiah 45:17-25
Amen
Because He doesn't love everybody.
Because millions of people in the world today lack knowledge of God.
He is willing to demonstrate His wrath and to make His power known.
What if God, although willing to demonstrate His wrath and to make His power known, endured with much patience vessels of wrath prepared for destruction? And He did so to make known the riches of His glory upon vessels of mercy, which He prepared beforehand for glory, — Romans 9:22-23
Oh I didn't read your question right I'm sorry. To that question I would respond by saying that He hides Himself.
Truly, You are a God who hides Himself, O God of Israel, Savior! — Isaiah 45:15
At that very time He rejoiced greatly in the Holy Spirit, and said, “I praise You, O Father, Lord of heaven and earth, that You have hidden these things from the wise and intelligent and have revealed them to infants. Yes, Father, for this way was well-pleasing in Your sight. All things have been handed over to Me by My Father, and no one knows who the Son is except the Father, and who the Father is except the Son, and anyone to whom the Son wills to reveal Him.” Turning to the disciples, He said privately, “Blessed are the eyes which see the things you see, for I say to you, that many prophets and kings wished to see the things which you see, and did not see them, and to hear the things which you hear, and did not hear them.” — Luke 10:21-24
The hearing ear and the seeing eye, The Lord has made both of them. — Proverbs 20:12
Jesus answered them, “To you it has been granted to know the mysteries of the kingdom of heaven, but to them it has not been granted. — Matthew 13:11
Because good is always one atomic mass heavier than evil. Its baked into the universe itself
The Christian God is one of the worst going. Why do you people continue to persist in this stupid Jewish mind trick? Fairy tales. Written by desert people in a time before deodorant. They knew nothing about anything. Ignoramuses' trying to make sense of existence and reality lacking any scientific explanation. Nothing more.
For the word of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God. For it is written, “I will destroy the wisdom of the wise, And the cleverness of the clever I will set aside.” Where is the wise man? Where is the scribe? Where is the debater of this age? Has not God made foolish the wisdom of the world? For since in the wisdom of God the world through its wisdom did not come to know God, God was well-pleased through the foolishness of the message preached to save those who believe. For indeed Jews ask for signs and Greeks search for wisdom; but we preach Christ crucified, to Jews a stumbling block and to Gentiles foolishness, but to those who are the called, both Jews and Greeks, Christ the power of God and the wisdom of God. Because the foolishness of God is wiser than men, and the weakness of God is stronger than men. — 1 Corinthians 1:18-25
If you were born 500 years ago in the Amazon, you wouldn't even have a concept of the Christian God.
Millions today living in cities with churches in every corner lack understanding and knowledge of who God is. I could have just as easily been one of them, if it wasn't for mercy. All of us are at the mercy of God.